Thanks. It was a 50mm Summilux v2, recently CLA'd by Leica, wide open. Post-process was in Lightroom: slight white balance adjustment, bumped the contrast a bit and dropped the vibrance a bit, to counteract the excessive vibrance boost of the contrast slider. Vibrance overall is still a bit more than what came out of the camera, though.
I have two 50mm Summilux v2s: a chrome one I bought from an RFFer, and a black one I got in a trade with Youxin. They draw pretty differently, and I don't have any clue why.